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Civil rights leaders confronted a California Highway Patrol official demanding answers about a video that went viral showing one officer repeatedly punching a women in the head on the side of the 10 Freeway. Ted Chen reports for NBC4 News at 6 p.m. from University Park Monday, July 07, 2014. (Published Monday, July 7, 2014)

The California Highway Patrol took to Facebook on Monday and asked for patience hours after civil rights activists gathered at the Los Angeles CHP office to demand answers about an officer's caught-on-camera confrontation with a woman on a Southern California freeway.

The video surfaced last week on YouTube after a witness posted cellphone footage he captured of the July 1 incident. The CHP officer can be seen straddling a woman on the ground and repeatedly hitting her in the face as commuters drive by on the 10 Freeway west of downtown LA.

"We want to find out whether she was charged or not. Number two, what are the policies and procedures?" said activist Najee Ali of the Project Islamic Hope. "Because to us, the officer wasn't trying to make an arrest. He was beating her excessively, so we want to find out why that happened."

"Please know that a complete and thorough investigation is underway to obtain all of the facts and evidence surrounding the incident. The CHP has a long history as a professional and respected law enforcement organization. We ask for your patience as we complete the detailed investigation process."

The woman in the video, identified as Marlene Pinnock, was held on a 72-hour involuntary mental health evaluation after the incident.

Pinnock has three prior convictions between 2004 and 2013, including lewd conduct, simple battery, and assault with a deadly weapon, police and court officials confirmed to the NBC4 I-Team. As of Monday, she has not been charged in the caught-on-video incident.

Pinnock's daughter and attorneys said she was injured with bruises on her upper body and "lumps the size of plums" after the incident, while the CHP said she was not hurt.

"Today was the first day I was finally able to see her and talk to her," Pinnock's daughter Maisha Allum said at a press conference Monday. "And I just thank God that she's alive."

The American Civil Liberties Union of Southern California released a statement Monday demanding a "full investigation" into the officer's use of force.

"We understand that in this incident, the CHP officer was responding to a call of a woman walking along a freeway, and the woman's state of mind was unclear. Officers are authorized to use force only when reasonably necessary to overcome force or danger posed by a subject," the statement read in part.

"But disturbing video raises serious questions whether, in those circumstances, it could possibly be reasonable for the CHP officer to pin Ms. Pinnock to the ground and punch her repeatedly. The CHP must conduct a full investigation and report the results to the public," the statement continued.

The CHP has placed the officer on desk duty, but will not release his identity. CHP officials first said the officer was on paid administrative leave but later confirmed to NBC4 that he is working from a CHP office.

"We want to make sure that (the officer) has some anonymity at this point in the investigation," Prieto said.